Search results
Results from the WOW.Com Content Network
Clar's rule states that for a benzenoid polycyclic aromatic hydrocarbon (i.e. one with only hexagonal rings), the resonance structure with the largest number of disjoint aromatic π-sextets is the most important to characterize its chemical and physical properties. Such a resonance structure is called a Clar structure. In other words, a ...
Phenanthrene is a polycyclic aromatic hydrocarbon (PAH) with formula C 14 H 10, consisting of three fused benzene rings. It is a colorless, crystal-like solid, but can also appear yellow. Phenanthrene is used to make dyes, plastics, pesticides, explosives, and drugs. It has also been used to make bile acids, cholesterol and steroids. [3]
According to one, the relative stability of phenanthrene compared to its isomers can be adequately explained by comparing resonance stabilizations. [8] Another critic argues that the stability of phenanthrene can be attributed to more effective pi-pi overlap in the central double bond; the existence of bond paths is not questioned but the ...
Common impurities are phenanthrene and carbazole. The mineral form of anthracene is called freitalite and is related to a coal deposit. [ 19 ] A classic laboratory method for the preparation of anthracene is by cyclodehydration of o-methyl- or o-methylene-substituted diarylketones in the so-called Elbs reaction , for example from o -tolyl ...
Pyrene is a polycyclic aromatic hydrocarbon (PAH) consisting of four fused benzene rings, resulting in a flat aromatic system. The chemical formula is C 16 H 10.This yellow-green solid is the smallest peri-fused PAH (one where the rings are fused through more than one face).
Director Jason Reitman received a less than glowing review of “Saturday Night” from “SNL” legend Chevy Chase. While speaking on the “Fly on the Wall” podcast, hosted by former “SNL ...
The linear compound propene has a pK a of 44, which is relatively acidic for an sp 3 carbon center because the resultant allyl anion can be resonance stabilized. The analogous cyclic system appears to have even more resonance stabilized, as the negative charge can be delocalized across three carbons instead of two.
"9 to 5" singer Dolly Parton opened up on Bunnie Xo's 'Dumb Blonde' podcast about why her husband Carl Dean doesn't like to attend any events with her.